Implement the webNavigation.onCommitted event.

chrome/common/page_transition_types.h

Index: chrome/common/page_transition_types.h
diff --git a/chrome/common/page_transition_types.h b/chrome/common/page_transition_types.h
index 71cd386d25f57a6d4f8df2bfcc87bd42491b2e64..8ca704226d2ee0f245536ec2316eade5588697a9 100644
--- a/chrome/common/page_transition_types.h
+++ b/chrome/common/page_transition_types.h
@@ -102,6 +102,9 @@ class PageTransition {
     // Any of the core values above can be augmented by one or more qualifiers.
     // These qualifiers further define the transition.
 
+    // User used the Forward or Back button to navigate among browsing history.
+    FORWARD_BACK = 0x01000000,
+
     // The beginning of a navigation chain.
     CHAIN_START = 0x10000000,
 
@@ -157,6 +160,9 @@ class PageTransition {
 
   // Return a string version of the core type values.
   static const char* CoreTransitionString(Type type);
+
+  // Return a string version of the qualifier type values.
+  static const char* QualifierString(Type type);
 };
 
 #endif  // CHROME_COMMON_PAGE_TRANSITION_TYPES_H__